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Credit Facilities, Long-Term Debt and Lease Liabilities - Principal Repayments (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 3,361 | $ 3,212
2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Lease commitments for short-term leases for which recognition exemption has been used | (13) |
Gross carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3,264 |
Lease liabilities | 134 |
Gross carrying amount | 2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 96 |
Lease liabilities | (5) |
Gross carrying amount | 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 626 |
Lease liabilities | 6 |
Gross carrying amount | 2023 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 277 |
Lease liabilities | 5 |
Gross carrying amount | 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 119 |
Lease liabilities | 5 |
Gross carrying amount | 2025 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 136 |
Lease liabilities | 5 |
Gross carrying amount | 2026 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 2,010 |
Lease liabilities | $ 118 |

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- Definition The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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